Increased Yields and Simplified Purification with a Second-Generation Cobalt Catalyst for the Oxidative Formation of <i>trans</i>-THF Rings
作者:Cory Palmer、Nicholas A. Morra、Andrew C. Stevens、Barbora Bajtos、Ben P. Machin、Brian L. Pagenkopf
DOI:10.1021/ol9023375
日期:2009.12.17
The synthesis of a second-generation cobalt catalyst for the formation of trans-THF products via the Mukaiyama aerobic oxidative cyclization is reported. Two procedures have been developed with the new water-soluble catalyst that give superior yields and greatly simplify purification compared to the previous catalysts.
stereoselective total synthesis of the reported structure of goniotrionin (4) has been accomplished. The key steps involved the opening of a chiral epoxide, a highlydiastereoselectiveMukaiyama aerobic oxidative cyclization, a selective 1,2-syn Mukaiyamaaldolreaction, and a Noyori reduction.
已经完成了所报道的促性腺激素(4)结构的立体选择性全合成。关键步骤包括打开手性环氧化物,高度非对映选择性的Mukaiyama有氧氧化环化,选择性的1,2- Syn Mukaiyama羟醛反应和Noyori还原。